3. Technical Description

Transcription

1 3. Technical Description

2 26 ENGINE 2RZ FE AND 3RZ FE ENGINE ENGINE 2RZ FE AND 3RZ FE ENGINE DESCRIPTION The 3RZ FE engine that is newly adopted in the Toyota Tacoma 4WD model is an in line, 4 cylinder, 2.7 liter, 16 valve DOHC engine used in the Toyota T100. As the successor to the 22R E engine in the 95 Truck application, the 3RZ FE is an ideal gasoline engine that offers outstanding features for commercial vehicles. The 2RZ FE engine that has been adopted in the 2WD model is a new engine that is based on the 3RZ FE, and has its piston stroke shortened to provide a total cylinder displacement of 2.4 liters. 2RZ FE Engine

3 ENGINE 2RZ FE AND 3RZ FE ENGINE 27 ENGINE SPECIFICATIONS AND PERFORMANCE CURVE Item Engine 2RZ FE 3RZ FE 22R E ( 95 Truck) No. of Cyls. & Arrangement 4 Cylinder, In line Valve Mechanism 16 Valve DOHC, Chain & Gear Drive 8 Valve OHC, Chain Drive Combustion Chamber Pentroof Type Multi Spherical Type Manifolds Cross Flow Fuel System MFI* 1 [EFI] Displacement cm 3 (cu. in.) 2438 (148.8) 2694 (164.4) 2367 (144.4) Bore x Stroke mm (in.) 95.0 x 86.0 (3.74 x 3.39) 95.0 x 95.0 (3.74 x 3.74) 92.0 x 89.0 (3.62 x 3.50) Compression Ratio Max. Output Max. Torque Valve Timing Intake Exhaust [SAE NET] [SAE NET] rpm ( rpm) 217 N rpm (160 ft rpm) rpm ( rpm) 240 N rpm (177 ft rpm) rpm ( rpm) 190 N rpm (140 ft rpm) Open 5 BTDC 14 BTDC Close 45 ABDC 54 ABDC Open 42 BBDC 58 BBDC Close 2 ATDC 18 ATDC Fuel Octane Number (RON) 91 Oil Grade API SH, EC II, ILSAC* 2 or Better * 1 : MFI (Multiport Fuel Injection) * 2 : ILSAC (International Lubricant Standardization and Approval Committee)

4 28 ENGINE 2RZ FE AND 3RZ FE ENGINE FEATURES OF 2RZ FE AND 3RZ FE ENGINE The features of the 2RZ FE and 3RZ FE engines and comparison between the 2RZ FE and 3RZ FE engines in the Toyota Tacoma and 3RZ FE engine in the 95 Toyota T100 are listed below. Item Engine Proper Valve Mechanism Cooling System Engine Control System Emission i Control System Details 95 Toyota Tacoma Toyota T100 2RZ FE 3RZ FE 3RZ FE A pentroof type combustion chamber plus high compression ratio. A highly rigid full balance crankshaft assembly and cylinder block. 2 balance shafts built into the cylinder block to reduce vibration and noise. Direct drive DOHC with a 4 valve cross flow layout for high intake/exhaust efficiency. A single timing chain with superb wear resistance. A scissors gear mechanism for the camshaft reduces the size of the cylinder head. An aluminum radiator core is used for weight reduction. * 1 A linear control type temperature controlled fluid coupling is used. MFI* 2 [EFI] system with a hot wire type mass air flow meter. Rotary solenoid type IAC* 3 [ISC] system and ESA* 4 system for precision in accordance with engine operating conditions. A diagnosis system conforming to OBD II. The charcoal canister has been enlarged to increase the absorption rate of the evaporative HC and to improve the * 5 efficiency of the system. 2 monolithic type three way catalytic converters are used. A large monolithic type three way catalytic converter is used. * 1 : Automatic Transmission Model Only * 2 : MFI (Multiport Fuel Injection) * 3 : IAC (Idle Air Control) * 4 : ESA (Electronic Spark Advance) * 5 : California specification models only.

5 ENGINE 2RZ FE AND 3RZ FE ENGINE 29 COOLING SYSTEM 1. Coupling Fan A linear control type temperature controlled fluid coupling has been adopted. This fan coupling linearly controls the fan speed in accordance with the temperature of air passing through the radiator. As a result, cooling performance is improved and fan noise reduced. Fan Coupling Characteristics EMISSION CONTROL SYSTEM 1. Evaporative Emission Control System Charcoal Canister On the 3RZ FE engine model, the construction of the charcoal canister for the California specification models is changed and its capacity is increased (847 cc 2000 cc) to improve the canister s HC absorption performance and efficiency. The construction of the charcoal canister is basically the same as the 95 Avalon. For details, see the 95 Avalon New Car Features (Pub. No. NCF113U), page 34.

6 30 ENGINE 5VZ FE ENGINE 5VZ FE ENGINE DESCRIPTION The 5VZ FE engine is a newly adopted V6, 3.4 liter, 24 valve DOHC engine used in the Toyota T100. Based on the 3VZ E engine used in the 95 Truck, this engine has realized both high performance and fuel economy through an increased total cylinder displacement and the adoption of the 4 valve mechanism. ENGINE SPECIFICATIONS AND PERFORMANCE CURVE Item Engine 5VZ FE 3VZ E (Toyota Tacoma) ( 95 Truck) No. of Cyls. & Arrangement 6 Cylinder, V Type Valve Mechanism 24 Valve DOHC Belt & Gear Drive 12 Valve OHC Belt Drive Combustion Chamber Pentroof Type Semi Heron Type Manifolds Cross Flow Fuel System SFI* 1 [EFI] MFI* 2 [EFI] Displacement cm 3 (cu. in.) 3378 (206.1) 2959 (180.5) Bore x Stroke mm (in.) 93.5 x 82.0 (3.68 x 3.23) 87.5 x 82.0 (3.44 x 3.23) Compression Ratio 9.6 : : 1 Max. Output Max. Torque Valve Timing Intake Exhaust [SAE NET] [SAE NET] rpm ( rpm) 298 N rpm (220 ft rpm) rpm ( rpm) 244 N rpm (180 ft rpm) Open 4 BTDC 11 BTDC Close 42 ABDC 51 ABDC Open 46 BBDC 53 BBDC Close 4 ATDC 9 ATDC Fuel Octane Number (RON) 91 Oil Grade API SH, EC II ILSAC* 3 or Better * 1 : SFI (Sequential Multiport Fuel Injection) * 2 : MFI (Multiport Fuel Injection) * 3 : ILSAC (International Lubricant Standardization and Approval Committee)

7 ENGINE 5VZ FE ENGINE 31 MAJOR DIFFERENCES Major differences between the 5VZ FE engine of the Toyota Tacoma and the Toyota T100 are listed below. Item Intake and Exhaust System Emission Control System Features A dual mode type resonator and a side branch type resonator are equipped with an air connector hose to reduce the intake air noise. A non linear throttle has been adopted in the throttle body of the 4WD model with a manual transmission. This throttle body smoothes out the engine s output characteristics when the accelerator pedal is depressed. As a result, the vehicle s drivability and off road performance have been enhanced. The charcoal canister, which is a component of the evaporative emission control system of the 4WD model for the California specification model, has been enlarged to increase the absorption rate of the evaporative HC and to improve the efficiency of the system. The construction of the charcoal canister is basically the same as the 95 Avalon. For details, see the 95 Avalon New Car Features (Pub. No. NCF113U), page 34.

8 32 ENGINE 5VZ FE ENGINE INTAKE AND EXHAUST SYSTEM 1. Air Cleaner and Intake Air Connector A large capacity air cleaner is used to increase the intake air efficiency and an element cap is attached to the air cleaner case to increase ease of servicing. The dual mode type resonator and the side branch type resonator are equipped with an air connector hose to reduce the intake air noise. 2. Throttle Body A non linear throttle has been adopted in the throttle body of the 4WD model with a manual transmission. This throttle valve opens slowly when the accelerator pedal is initially depressed and later increases its opening according to the amount of pedal effort applied to the accelerator pedal. In addition to improving the vehicle s control performance during low speed driving, this feature enhances the engine s response performance during medium to high load conditions. As a result, the vehicle s drivability and off road performance have been enhanced.